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Ancient Egyptian sundial (c. 1500 BC), from the Valley of the Kings, used for measuring work hour. Daytime divided into 12 parts. The ancient Egyptians were one of the first cultures to widely divide days into generally agreed-upon equal parts, using early timekeeping devices such as sundials, shadow clocks, and merkhets (plumb-lines used by early astronomers).
Electronic time clock. A time clock, sometimes known as a clock card machine, punch clock, or time recorder, is a device that records start and end times for hourly employees (or those on flexi-time) at a place of business. In mechanical time clocks, this was accomplished by inserting a heavy paper card, called a time card
Huygens first used a clock to calculate the equation of time (the difference between the apparent solar time and the time given by a clock), publishing his results in 1665. The relationship enabled astronomers to use the stars to measure sidereal time , which provided an accurate method for setting clocks.
The completed pyramid will have taken just shy of a decade less to build than Wemding's age at the time that the first block was laid. The pyramid, when completed in the year 3183 , is scheduled to consist of 120 stone or concrete blocks, each measuring 1.2 m (3.9 ft) long, 1.2 m (3.9 ft) wide and 1.8 m (5.9 ft) tall.
The next 3 decades saw the development of quartz clocks as precision time standards in laboratory settings; the bulky delicate counting electronics, built with vacuum tubes, limited their use elsewhere. In 1932 a quartz clock was able to measure tiny variations in the rotation rate of the Earth over periods as short as a few weeks. [39]
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Image source: The Motley Fool. Dynatrace (NYSE: DT) Q3 2025 Earnings Call Jan 30, 2025, 8:00 a.m. ET. Contents: Prepared Remarks. Questions and Answers. Call ...